Paper-making- machine



Sept. 14,1926.

. J. D. TOMPKINS PAPER MAKING MACHINE Filed Jan. 13. 1925 Patented Sept. 14, 1 926.

UNITED r STA E AT OF IC -j,

JOHN D. TOMPKINS, or vAL rInnEw YORK;

, PAPER-MAKING MAorrInE.

Applicatiou filed January 13, 1925. I Serial No. 2,065.

The invention in certain of its aspects re-l lates more particularly to a paper-making machine of the Fourdrinier type, wherein the stock is initially depositedupon a forming wire, and has for an objectsto provide a simple and eificient arrangement for re moving water or'moisturefrom the fibres while carried. by the forming wire, and without injuring the newly formed paper web.

The invention also aims to carry the paper'web along from the forming wire and throughthe press rolls without necessitating bends or undulationswhich are liable I to injure the web, andto continually support the web in its travelfroni theforming wire to the drying section of the machine,

thuseliminating any stretch or sag which taken in conjunction withjthe accompany,

ing drawings, discloses apreferred embodiment thereof; such embodiment, however,

' paper web 3.

is to be considered as merely illustrative of its principles. In the drawings:: 3 The singe figure is a diagrammatic longitudinal sectional view of certain parts of a; paper-making machine constructed in accordance with the invention. 7 a

1 Referring to the drawing, I have disclosed a paper making machine of the Fourdrinier type having a forming wire 1' passing around a lower couch roll 2, the

paper webS being initially deposited upon the forming wire in the usual-manner, after which the web passes between upper r and lower felt aprons 4 and5 respectively,t0

upper and lower press rolls 6' and 7, aud

from thence to the driers 8.; I I t In accordance with the present invention,

the upper felt apron 4 is extended over to overlie the forming wire 1, andruns around a roller19 which presses the felt api on into engagement with the upper surface of the 'An upper couch roll 10 is also employed, and this roll I prefer to locate' slightly in advance of lower couch roll 2, in such manner that its weight is partiallyycarried the lower couch roll and partially by the forming wire, thus re-i lieving the forming wire to some extent from being pressed too tightly betweenthe rolls, and more efiiciently expressing mois-s ture from the upper felt apron 4, to render it more certain that the web 8 will be carried along by and in contact with the upper felt apron from the couch rolls, instead of sagging and stretching, as would be the case ifthe web traveledalongunsupported' A plurality of rollers 11 underlie the forming wire 1 and serve to support the latter in the region where thefelt apron A overlies the same.

During the time that the paper web 13 is 5 supported between the forming wire and the felt apron 4 I withdraw water and moisturefrom underneath by means, of oneor more suction boxes 12 which underlie the forming w re 1. The suctionis aided by gravity,being in a downward direction, and furthermore the removal of water in the abovemanner does not vnecessitate the bending of the paper web in such a jwayfastoinjure the bond between thenewly deposited fibres, but it will be noted thatthe web travels along in a substantially flat condition which does not destroy the bond. The suctionboxesl also are relatively inexpensive and require only a small amount of power, as compared to other devices such'as suction rollers, which latter would also re-' quire the bending of the paper web to make the suction effective. s

I prefer also to employ in connection with the suction boxes above mentioned, one or more air blast pipes '13 which direct a downwardly-directed blast of air through. the upper felt apron to augment the drying action ofthe suction boxes. This also'maybe done without injury to the paper web, since the latter is supported between the i felt apron and forming wire at all points be-,

tween the rolls 9 and 10, sot-hat the fibres are .not readily displaced. The partial drying of the paper web while upon the forming wire as above, described tends to stabilize the fibres with their loadings in thebodyofthe web, an render it'less likely thatthesame willbe squeezed out at the press rolls.

The paper web is then carried along from the couch rolls by the upper felt apron i into connection with the lower felt apron 5,

and between the press rolls. To relieve the lower felt apron from an excess of water at the press rolls, I prefer to employ a suction 14 under the lower felt apron 5 adjacent its junction point with the upper felt apron and paper web.

I also prefer to extend the upper felt apron 4 beyond the press rolls, and bring it; over intocontact with a separating roll 15, or first drier, the u er felt apron running around a roll 16 in the present instance for the above purpose. The lower felt apron 5 also follows along with the upper felt apron for a short distance beyond the press rolls, and passes around a blow roll 17 from within which a blast of air is directed on to the paper web 3 to insure that the latter will be carried along by and in Contact with the upper felt apron 4. Thus the paper web will be 'adequ'ately supported against stretch or sag at this point in its travel. a

While a specific embodiment of the invention has been described, it will be obvious that many changes may be made therein without de arting from its principles, as defined in the appended claims.

I claim v y 1. A paper ma'king machine comprising a forin'i'iig wire a felt apron overlying a substantial'ly flat section of the same to hold a length of the paper web in "substantially fiat condition against the forming wire, and a; suction box disposed beneath said section of the forming wire to withdraw waterwhile the web is held "be'tii een the felt apron and the formin wire. A

2. A paperqnalring machine comprising a forming wire 'a 'felt apron 'o'verlyinga substaiitially flat sectionofthe same to hold a length of the paper web infsubstan'tially flat con'dition'against the "forming wire,'and means for directing a'bla'sto'f air under'pre ssure down onto 'theoyerlyingpartofthe felt apron.

3. A paper-making i'nac'hi'ne comprising a forming wire, a felt apron "overlying a substantially flat section of the -same to hold a length'of the paper web in substantially flat condition against the forming wire, a suetiongbox disposed beneath said section-ofthe forming wire to withdraw water while the web is held between the felt apron and the forming wire, and "means for directing "a blast of air downonto the overlying part of said felt apron to act in conjunction with said suctionbo'x.

4. A paper-making machine comprising a formin'gwire, press rolls, anu'pper felt apron passing between "said press rolls and also overlying substantially flat section "of the forming wire to hold a length of the newly formed paper web in substantially flat condition against the forming wire a suction box disposed beneath said section of the forming wire to withdraw water While the said web is held between the upper felt apron and the forming wire, a lower felt apron meeting the upper felt apron at a point between the forming wire and the press rolls, whereby the upper felt apron leads the paper web into contact with said lower felt apron and a suction device underlying said lower felt apron adjacent its abovementioned point of meeting with the upper felt apron.

5. A paper-making machine comprising press rolls with upper and lower felt aprons passing therebetwcen, said upper felt apron also extending over into contact with the first roll of the drier section of the machine, said lower felt apron also extending along with the upper felt apron somewhat beyond the press rolls, and means for directing a blast of air onto the abovemefntio'ned 'extending portion of the lower felt apron to cause the paper web to follow the upper felt apron.

"6. A paper-making machine comprising press rolls with upper and lower felt apron-s passing therebetween, said upper ttel-t aip'ron also extending over into contact with "the first roll of the drier section of the machine, said lower felt apron also extending along with the upper felt apron somewhat beyond the press rolls, and -a blow roll around which the above-mentioned extending portion of the lower felt apron passes.

7. A paper-making machine comprising a forming wire, a felt apron over-lying a substantially fla't section of the same to hold a length of the paper'web in substantially i-lat condition against "the forming wire, and means for withdrawing water in 'a downward direction through the forming Wire from the paper web while the latter is held between the "felt apron and the forming wire. I

8. A paper-making machine coinprisi-ng press rolls with upper and lower felt aprons passing 'therebetween, said upper felt apron also extending over into contact with the first roll of the drier section o'f the machine, and means for directing a blast 'of air through the lower felt apron to eause the paper web to 'follow *the upper felt apron after the web leaves' th'e press rolls.

In testimony that I claim the for'egoing, I have hereunto set HI-y hand "this 5th day of January, 1925.

tFGHN D. TO'MPKINS. 

